Well I know when Jack Madden was Playing at the Top of his Game he worked as an Electrician doing Big Commercial Type Electrician Work...
Think few of the Pool Pro's as you call em do not have Real, or Side Jobs, as as a Group Top Pool players are not make the money other Sport Pay their Top Players.
Like NBA Basketball, Major league Baseball, NHL hockey, NFL fooball, NASCAR Drivers.
Remember when living in Sacramento, and Tony "the Tiger" Lopez was a World Champion Boxer living in Sacramento.
He work in a Lumber Yard, and for a Bail Bondsman. Even though he held both the World Lightweight Champions & World Super Featherweight Champions.